Quantum One Zero Digressive Front PistonsThe Quantum One Zero and Two Zero belong to a family of mono-tube shock absorbers with excellent interchangeability of parts. What follows is a brief description of the operation of these shock absorbers.We have been working with Quantum since 2013 and were one of the first specialists to use and develop the Zero range of dampers.� We tested and developed our own valving which now has many thousands and thousands of our own and many happy customer miles in use.� We constantly review and refine the valving taking all feedback from customers into account and then using our damper dyno to review any new ideas.This kit has the Digressive/Linear pistons in the front dampers but we feel this addition is not best suited at the rear so we keep these using the regular linear piston.The Quantum One Zero damper is a fantastic mid level damper. It has none of the "complications" that many people feel may find them "getting lost" on settings. One adjustment for both Bump (compression) and rebound. Fully upgradeable in the future, they can be rebuilt into the "Two Zero" specification.These dampers have been specified to our own dimensions and valving. We will make sure to refine this valving and the recommended spring rates depending upon the exact car description and your intended use.� Make sure to call us to discuss this before ordering.These dampers have been specified to our own dimensions and valving. They make a step beyond the other 1 way dampers we supply.These suspension kits are supplied with our recommended premium springs..Hyperco Springs are available as an additional Cost option.We are Approved Quantum Service Agents.The document below is the Quantum One Zero Damper Manual - very informative reading.